fix: parallel index build

[vigsterkr]

fix #47

[github-actions]

Benchmark Results

Status	Count
Regressions	22
Improvements	69
No change	21

Regressions

                 change:
                        time:   [+2.1375% +2.4020% +2.6509%] (p = 0.00 < 0.05)
                        thrpt:  [−2.5825% −2.3456% −2.0928%]
                        Performance has regressed.

                 change:
                        time:   [+13.031% +13.133% +13.223%] (p = 0.00 < 0.05)
                        thrpt:  [−11.678% −11.608% −11.528%]
                        Performance has regressed.

                 change:
                        time:   [+2.5937% +2.6917% +2.7822%] (p = 0.00 < 0.05)
                        thrpt:  [−2.7069% −2.6211% −2.5281%]
                        Performance has regressed.

                 change:
                        time:   [+12.092% +12.140% +12.191%] (p = 0.00 < 0.05)
                        thrpt:  [−10.866% −10.826% −10.787%]
                        Performance has regressed.

                 change:
                        time:   [+9.1558% +9.2321% +9.3563%] (p = 0.00 < 0.05)
                        thrpt:  [−8.5558% −8.4518% −8.3878%]
                        Performance has regressed.

                 change:
                        time:   [+2.8405% +2.9257% +3.0082%] (p = 0.00 < 0.05)
                        thrpt:  [−2.9204% −2.8425% −2.7621%]
                        Performance has regressed.

                 change:
                        time:   [+12.109% +12.188% +12.267%] (p = 0.00 < 0.05)
                        thrpt:  [−10.927% −10.864% −10.801%]
                        Performance has regressed.

postings_intersect_union/roaring/union/medium
                        time:   [2.2913 µs 2.2953 µs 2.2994 µs]
                        change: [+1.2588% +1.6003% +1.9505%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/roaring/encode/low
                        time:   [67.531 ns 67.577 ns 67.619 ns]
                        change: [+1.7414% +1.8815% +2.0215%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/roaring/decode/low
                        time:   [101.74 ns 101.85 ns 101.99 ns]
                        change: [+1.3358% +1.4933% +1.6602%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/roaring/encode/medium
                        time:   [461.61 ns 461.98 ns 462.49 ns]
                        change: [+15.729% +15.922% +16.084%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/hybrid_auto/encode/medium
                        time:   [461.28 ns 461.47 ns 461.68 ns]
                        change: [+15.839% +15.906% +15.984%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/roaring/encode/high
                        time:   [4.0811 µs 4.0837 µs 4.0872 µs]
                        change: [+15.397% +15.532% +15.662%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/hybrid_auto/encode/high
                        time:   [4.0831 µs 4.0840 µs 4.0848 µs]
                        change: [+15.326% +15.413% +15.494%] (p = 0.00 < 0.05)
                        Performance has regressed.

postings_encode_decode/vec_fixed/decode/high
                        time:   [3.6382 µs 3.6406 µs 3.6436 µs]
                        change: [+3.2867% +3.3564% +3.4273%] (p = 0.00 < 0.05)
                        Performance has regressed.

query_planner/decompose/literal_camel
                        time:   [400.91 ns 428.17 ns 456.58 ns]
                        change: [+4.8380% +8.7896% +13.394%] (p = 0.00 < 0.05)
                        Performance has regressed.

query_planner/decompose/regex_word_boundary
                        time:   [85.146 ns 85.213 ns 85.320 ns]
                        change: [+1.3162% +1.6294% +1.9323%] (p = 0.00 < 0.05)
                        Performance has regressed.

query_planner/plan/regex_word_boundary
                        time:   [95.956 ns 96.060 ns 96.175 ns]
                        change: [+2.0774% +2.2186% +2.3587%] (p = 0.00 < 0.05)
                        Performance has regressed.

end_to_end_search/plan_only/regex_digit
                        time:   [652.16 ns 652.59 ns 653.13 ns]
                        change: [+1.5151% +1.7799% +2.0235%] (p = 0.00 < 0.05)
                        Performance has regressed.

end_to_end_search/plan_only/regex_word_boundary
                        time:   [96.716 ns 96.764 ns 96.830 ns]
                        change: [+3.8204% +3.9152% +4.0181%] (p = 0.00 < 0.05)
                        Performance has regressed.

git_overlay/detect_dirty_files
                        time:   [2.4475 µs 2.4494 µs 2.4516 µs]
                        change: [+1.0308% +1.1234% +1.2283%] (p = 0.00 < 0.05)
                        Performance has regressed.

Benchmarking git_overlay/head_commit: Analyzing
git_overlay/head_commit time:   [2.4483 µs 2.4520 µs 2.4564 µs]
                        change: [+1.1813% +1.3132% +1.4335%] (p = 0.00 < 0.05)
                        Performance has regressed.

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